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TIN surface modification

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rplese
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TIN surface modification

I import LDT's (2006) TIN surfaces and modify them. I have trouble limiting the maximum or minimum elevation.
I have tried:
Toolspace>Properties>[surface name]>Surface Properties>Definition>Build>Definition Options

But the "Exclude elevations less than" and the "Exclude elevations greater than" are grayed out and can not be selected. Is there another route to get this done?
Bear
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fbasciano
in reply to: rplese

In Civil 3D 2013:

 

Under Surface Properties, Definition, Build,;set "Exclude elevations less than" to "Value" YES.

 

You may now set a minimum elevation>

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